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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00cac0181da1f4c4d3f42a5f64f35d5116632a571eec70227c5183d35dec38d' 
  AND token = 'E5BbngxclOcnWln9g4uT07Jdw2ZjbuYUxlpgxmDzG14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}